Years ago, perhaps 20 or more, I read a novel dealing with short distance time travel and micro-black holes. My memory seems to say it was written by James P. Hogan. But I've searched all his novels and haven't found it.
I read this about the same time as I was reading The Genesis Machine. There were two characters that were involved in testing time travel or events that took place only a few minutes apart, maybe even a few seconds.
The micro-black holes were theorized to penetrate the earth without doing much, if any, damage.
Somehow, perhaps because of relativistic effects, time was altered just enough that events that took place a few seconds earlier were made apparent in the present.